The group chooses a nontrivial approach to develop novel ultrashort pulse lasers systems in simple configurations with tailored and outstanding spectral and temporal properties by shaping the generation via internal nonlinear and dispersive phenomena and exploring all avenues of available optical fibre materials and geometries. Innovative laser sources will enable investigation of the fundamental physics of nonlinear phenomena and frequency conversion to mid-infrared, therefore matching fundamental vibration bands of target molecules.
OUR RESEARCH TOPICS
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REAL-TIME CHARACTERISATION OF ULTRASHORT PULSES
Advancing fundamental science and applications
MAMYSHEV OSCILLATOR-BASED ULTRAFAST FIBRE LASERS
Beyond conventional mode-locking
SHORT-WAVE AND MID-IR FIBRE LASERS
Discovering new operational wavelengths
REAL-TIME OBSERVATION OF THE OPTICAL SAGNAC EFFECT IN ULTRAFAST BIDIRECTIONAL FIBRE LASERS
APL Photonics 5, 016104 (2020)
The optical Sagnac effect sets fundamentals of the operating principle for ring laser and fiber optic gyroscopes, which are preferred instruments for inertial guidance systems, seismology, and geodesy. Operating at both high bias stability and angular velocity resolutions demands special precautions like dithering or multimode operation to eliminate frequency lock-in or similar effects introduced due to synchronization of counterpropagating channels. Recently, to circumvent these limitations, ultrashort pulsed radiation was suggested to supersede conventional continuous wave operation. Despite the ultrafast nature of ultrashort pulse generation, the interrogation of the Sagnac effect relies on highly averaging measurement methods. Here, we demonstrate the novel approach to the optical Sagnac effect visualization by applying real-time spatio-temporal intensity processing and time-resolved spectral domain measurements of ultrashort pulse dynamics in rotating the bidirectional ring fiber laser cavity. Our results reveal the high potential of application of novel methods of optical Sagnac effect measurements, allowing enhancement of rotation sensitivity and resolution by several orders of magnitude.
BUILD-UP DYNAMICS IN BIDIRECTIONAL SOLITON FIBRE LASER
Photonics Research (accepted)
Bidirectional ultrafast fibre lasers present an attractive solution, enabling the generation of two mutually coherent ultrashort pulse trains in a simple and turnkey system. Still, the lack of a comprehensive numerical model describing steady-state bidirectional generation, and even less ultrafast soliton breakdowns and collisions, is obstructing the achievement of the performance compared with unidirectional lasers.In this paper, we have experimentally investigated real-time build-up dynamics of counter-propagating solitons in ultrafast ring Er-doped fibre laser via the dispersive Fourier transform methodology. We demonstrate that counter-propagating pulses experience independent build-up dynamics from modulation instability, undergoing breathing dynamics and diverging sub-ordinate pulse structures formation and annihilation to a stable bidirectional pulse train. Yet, interaction of pulses in the cavity presents the key underlying phenomenon driving formation evolution distinct form unidirectional pulse build-up. Our findings will provide physical foundations for bidirectional ultrafast fibre laser design to carry forward their application.
DR MARIA CHERNYSHEVA
Junior research group leader
Maria obtained her PhD degree in Laser Physics from Fiber Optics Research Center of the Russian Academy of Sciences in 2014. She moved to UK shortly after where she worked at Aston University as Research Fellow. Maria has won three highly competitive and prestigious Fellowships in four years: Russian President Scholarship, Marie Skłodowska-Curie Individual Fellowship (EU Horizon2020) and Engnineering for Development Research Fellowship from Royal Academy of Engineering and Global Challenges Research Fund. From beginning of 2019 Dr. Chernysheva has been a leader of Junior Research Group “Ultrafast fibre lasers” at Leibniz-IPHT
DR OGUZHAN KARA
Marie S.-Curie Research Fellow
Oguzhan has received his PhD in Physics from Heriot Watt University, UK in 2018. Then he worked as a research associate in Ultrafast Optics Group (led by Prof. Derryck T. Reid) .His research interests include ultrashort fiber lasers, optical frequency combs, optical parametric oscillators, and midinfrared spectroscopy.
DENNIS CHRISTIAN KIRSCH
Dennis joined IPHT in October 2019. He studied laser technology and photonics at the University of Applied Sciences Münster. He got MSc degree from the Laser Zentrum Hannover e.V. in 2017. Afterwards he worked as research associate at the Fraunhofer Heinrich Hertz Institute.
DR ISMAEL CHIAMENTI
Visiting Research Fellow
Ismael joined our group at Leibniz-IPHT in February 2020 for one year to work on FBG inscription in special optical fibres.
RECENT & UPCOMING EVENTS
Conference presentations, participation at meetings and workshops
SPIE PHOTONICS EUROPE
01 Apr 2020 12:20 PM, Strasbourg, France
WOMEN IN PHOTONICS WORKSHOP (CANCELED)
14-16 July 2020, Jena, Germany
INTERNATIONAL WORKSHOP ON FIBER LASERS (NONLINEAR PHOTONICS SCHOOL FOR YOUNG SCIENTISTS)
20-24 August 2020, Novosibirsk, Russia
28TH INTERNATIONAL CONFERENCE ON ADVANCED LASER TECHNOLOGIES
6-8 September 2020, Arcachon, France
OUR PROJECTS AND RESEARCH FUNDING
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